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How clathrin-coated pits control nanoparticle avidity for cells.

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Clathrin-coated pits (CCPs) significantly enhance nanoparticle binding to cells by matching particle geometry, increasing avidity by up to 100-fold. Their absence drastically reduces cellular interaction with nanoparticles.

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Area of Science:

  • Cell biology
  • Nanotechnology
  • Biophysics

Background:

  • Clathrin-coated pits (CCPs) are crucial for endocytosis of various particles.
  • The geometric role of CCPs in nanoparticle-cell interactions remains understudied.
  • Ligand-receptor interactions govern nanoparticle binding avidity.

Purpose of the Study:

  • To investigate the impact of CCP geometry on nanoparticle binding avidity.
  • To test the hypothesis that membrane curvature matching enhances binding.
  • To quantify the effect of CCPs on nanoparticle-cell interactions.

Main Methods:

  • Utilized multivalent nanoparticles targeting angiotensin II receptor type 1.
  • Employed cholesterol extraction to inhibit CCP formation.
  • Developed a theoretical model to predict binding energy changes.

Main Results:

  • Inhibition of CCPs led to a 67-100 fold decrease in nanoparticle avidity.
  • Theoretical model accurately predicted the observed decrease in binding.
  • Cellular visibility of nanoparticles changed by two orders of magnitude with/without CCPs.

Conclusions:

  • CCP geometry plays a critical role in enhancing nanoparticle binding avidity.
  • Membrane curvature matching by CCPs significantly boosts ligand-receptor interactions.
  • Cellular recognition of nanoparticles is highly dependent on CCP presence.